Let’s imagine that organs can be perfectly grown in a lab and installed into a body without any chance of rejection or other complications usually associated with organ transplant.
You, a perfectly healthy adult human, go to the doctor and have them put a second heart in your chest that is connected to the circulatory system with your original heart.
What would be the effects of this? Could it even be done in this hypothetical situation at all?
We already have synch issues with a single heart (things like arrythmias). I’m not sure two hearts in a mammal would even work, given the increase in distance for signaling - seems a lot of opportunity for error.